Diana Hassel

Equine Section Head and Professor, Equine Emergency and Critical Care Clinical Sciences


(970) 297-4271

About Diana

Dr. Hassel is an Associate Professor of Equine Emergency Surgery & Critical Care and helped establish the 24/7 Equine Critical Care service at CSU in 2004. She has been a specialist in the area of equine colic since completion of her surgical residency in 1997 and has furthered her background in critical care medicine for the horse by obtaining board certification by the American College of Veterinary Emergency & Critical Care in 2007. Her research interests are focused on treatment of the critically ill equine patient, with particular interests in colic, the equine gastrointestinal microbiome and endotoxemia.


PhD, Comparative Pathology, University of California, Davis , 2003DVM, Veterinary Medicine, University of California, Davis, 1993BS, Animal Science, University of California, Davis , 1989


Diplomate, American College of Veterinary Surgeons--1998
Diplomate, American College of Veterinary Emergency & Critical Care--2007


Pablo Trigo, Ana Muñoz, Francisco Castejón, Cristina Riber, Diana M Hassel. Rib fracture in a horse during an endurance race. Can Vet J. Accepted for publication 2010.Chiavaccini L, Hassel DM. Clinical features and prognostic variables in 109 horses with esophageal obstruction (1992-2009). J Vet Intern Med 2010;24(5):1147-52.Soffler C, Campbell VL, Hassel DM. Measurement of urinary F2-isoprostanes as markers of in vivo lipid peroxidation: a comparison of enzyme immunoassays with gas chromatography-mass spectrometry in domestic animal species. J Vet Diagn Invest. 2010 Mar;22(2):200-9. Chiavaccini L, Hassel DM, Shoemaker ML, Charles JB, Belknap JK, Ehrhart EJ. Detection of calprotectin and its correlation to apoptosis within the equine colon from horses with black walnut extract-induced laminitis. Submitted for publication Aug, 2010 to Am J Vet Res. Currently under review.Hassel DM, Hill AE, Rorabeck RA. Association between hyperglycemia and survival in 228 horses with acute gastrointestinal disease. J Vet Intern Med. 2009;23(6):1261-5.Hassel DM, Smith PA, Nieto JE, Baldomenico P, Spier SJ. Di-tri-octahedral smectite for the prevention of post-operative diarrhea in equids with surgical disease of the large intestine: Results of a randomized clinical trial. Vet J. 2009 Nov;182(2):210-4.Hassel DM, Spier SJ, Aldridge BM, Watnick M, Argenzio RA, Snyder JR. Influence of diet and water supply on mineral content and pH within the large intestine of horses with enterolithiasis. Vet J. 2009 Oct;182(1):44-9.Hassel DM, Aldridge BM, Drake CM, Snyder JR. Evaluation of dietary and management risk factors for enterolithiasis among horses in California. Res Vet Sci. 2008 Dec;85(3):476-80.Lawler JB, Hassel DM, Magnuson RJ, Hill AE, McCue PM, Traub-Dargatz JL. Adsorptive effects of di-tri-octahedral smectite on Clostridium perfringens alpha, beta, and beta-2 exotoxins and equine colostral antibodies. Am J Vet Res. 2008 Feb;69(2):233-9.Feary DJ, Hassel DM. Enteritis and colitis in horses. Vet Clin North Am Equine Pract. 2006;22(2):437-79.

Research Specialty

Equine Exclusive/PredominantClinical specialty: Colic, trauma, emergency medicine. Research interests: Colic, equine GI microbiome, endotoxemia, enterolithiasis, critical care. Teaching interests: Innovative teaching methods, equine gastroenterology